Search Publications
High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst
Rodriguez, J.; Fender, R.; Dubus, G. +7 more
We report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray binary V404 Cygni during its outburst in 2015 June-July. Detailed analyses reveal a possible excess of γ-ray emission on 2015 26 June, with a very soft spectrum above 100 MeV, at a position consistent with the direction of V404 Cyg (within the 95 per ce…
The JCMT and Herschel Gould Belt Surveys: a comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495
Hill, T.; Könyves, V.; Palmeirim, P. +27 more
We present a comparison of Submillimetre Common User Bolometer Array-2 (SCUBA-2) 850-µm and Herschel 70-500-µm observations of the L1495 filament in the Taurus Molecular Cloud with the goal of characterizing the SCUBA-2 Gould Belt Survey (GBS) data set. We identify and characterize starless cores in three data sets: SCUBA-2 850-µ…
Early science with the Large Millimetre Telescope: Deep LMT/AzTEC millimetre observations of ɛ Eridani and its surroundings
Dent, W. R. F.; Eiroa, C.; Marshall, J. P. +21 more
ɛ Eridani is a nearby, young Sun-like star that hosts a ring of cool debris analogous to the Solar system's Edgeworth-Kuiper belt. Early observations at (sub-)mm wavelengths gave tentative evidence of the presence of inhomogeneities in the ring, which have been ascribed to the effect of a putative low eccentricity planet, orbiting close to the rin…
Ancient eruptions of η Carinae: a tale written in proper motions
Smith, Nathan; Reiter, Megan; Kiminki, Megan M.
We analyse eight epochs of Hubble Space Telescope Hα+[N II] imaging of η Carinae's outer ejecta. Proper motions of nearly 800 knots reveal that the detected ejecta are divided into three apparent age groups, dating to around 1250 A.D., to around 1550 A.D., and to during or shortly before the Great Eruption of the 1840s. Ejecta from these groups re…
Pathways to quiescence: SHARDS view on the star formation histories of massive quiescent galaxies at 1.0 < z < 1.5
Barro, Guillermo; Pérez-González, Pablo G.; Koekemoer, Anton M. +12 more
We present star formation histories (SFHs) for a sample of 104 massive (stellar mass M > 1010 M⊙) quiescent galaxies (MQGs) at z = 1.0-1.5 from the analysis of spectrophotometric data from the Survey for High-z Absorption Red and Dead Sources (SHARDS) and HST/WFC3 G102 and G141 surveys of the GOODS-North field, jointly wit…
Is the escape velocity in star clusters linked to extended star formation histories? Using NGC 7252: W3 as a test case
Rejkuba, M.; Cabrera-Ziri, I.; Bastian, N. +9 more
The colour-magnitude diagrams of some intermediate-age (1-2 Gyr) star clusters show unexpectedly broad main-sequence turnoffs, raising the possibility that these clusters have experienced more than one episode of star formation. Such a scenario predicts the existence of an extended main-sequence turnoff (eMSTO) only in clusters with escape velocit…
Ultraviolet diversity of Type Ia Supernovae
Fox, O. D.; Kirshner, R. P.; Foley, Ryan J. +9 more
Ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) probe the outermost layers of the explosion, and UV spectra of SNe Ia are expected to be extremely sensitive to differences in progenitor composition and the details of the explosion. Here, we present the first study of a sample of high signal-to-noise ratio SN Ia spectra that extend blu…
Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
Zejda, M.; Skarka, M.; Liška, J. +2 more
This paper presents an extensive overview of known and proposed RR Lyrae stars in binaries. The aim is to revise and extend the list with new Galactic field systems. We utilized maxima timings for 11 RRab type stars with suspicious behaviour from the GEOS data base, and determined maxima timings from data of sky surveys and our own observations. T…
Towards a comprehensive picture of powerful quasars, their host galaxies and quasar winds at z ∼ 0.5
Zakamska, Nadia L.; Wylezalek, Dominika; Obied, Georges +1 more
Luminous type-2 quasars in which the glow from the central black hole is obscured by dust are ideal targets for studying their host galaxies and the quasars' effect on galaxy evolution. Such feedback appears ubiquitous in luminous obscured quasars where high-velocity-ionized nebulae have been found. We present rest-frame yellow-band (∼5000 Å) obse…
A lucky imaging multiplicity study of exoplanet host stars - II
Avenhaus, H.; Ginski, C.; Mugrauer, M. +6 more
The vast majority of extrasolar planets are detected by indirect detection methods such as transit monitoring and radial velocity measurements. While these methods are very successful in detecting short-periodic planets, they are mostly blind to wide sub-stellar or even stellar companions on long orbits. In our study, we present high-resolution im…